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Abstract

We report on a new design for a passively mode locked fibre laser employing all normal dispersion polarisation maintaining fibres operating at 1 μm. The laser produces linearly polarized, linearly chirped pulses that can be recompressed down to 344 fs. Compared to previous laser designs the cavity is mode-locked using a nonlinear amplifying fibre loop mirror that provides an additional degree of freedom allowing easy control over the pulse parameters. This is a robust laser design with excellent reliability and lifetime.

Figures (3)

(a) Photodetector signal of the single pulse mode-locked pulse train generated by the fiber oscillator. (b) Typical output spectrum when mode-locked at a repetition rate of 10 MHz. The spectrum is shown on a log plot in arbitrary units. The insert shows the spectrum on a linear plot.